RT77452. Add support for Emcraft's LPC-LNX-EVB board
* Add Makefile target `lpc-lnx-evb_config`. * Configure one more EMC address pin on LPC-LNX-EVB (in comparison to EA-LPC1788) to make all 16 MBytes of NOR Flash work. * Remove pin configuration for UART2 (compared to EA-LPC1788), it is not supported by this board. * Disable PLL1 and USB clock configuration. * The NOR Flash is CFI-compatible, so we do not need to use `CONFIG_FLASH_CFI_LEGACY` unlike EA-LPC1788. * Update MAC and IP address.